WO2015141047A1 - カバー部材および緩衝装置 - Google Patents
カバー部材および緩衝装置 Download PDFInfo
- Publication number
- WO2015141047A1 WO2015141047A1 PCT/JP2014/078049 JP2014078049W WO2015141047A1 WO 2015141047 A1 WO2015141047 A1 WO 2015141047A1 JP 2014078049 W JP2014078049 W JP 2014078049W WO 2015141047 A1 WO2015141047 A1 WO 2015141047A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- axial
- dust cover
- axial direction
- peak
- valley
- Prior art date
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/38—Covers for protection or appearance
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/50—Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall
- F16J15/52—Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall by means of sealing bellows or diaphragms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J3/00—Diaphragms; Bellows; Bellows pistons
- F16J3/04—Bellows
- F16J3/041—Non-metallic bellows
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J3/00—Diaphragms; Bellows; Bellows pistons
- F16J3/04—Bellows
- F16J3/041—Non-metallic bellows
- F16J3/043—Non-metallic bellows with particular means for limiting wear
Definitions
- the present invention relates to a cover member and a shock absorber.
- a cover member is used to cover and protect an outer periphery of a piston rod or a cylinder in a hydraulic shock absorber provided in a suspension system (suspension).
- the bellows body (cover member) described in Patent Document 1 is formed of a series of peak and valley portions except for the attachment portions of both terminals when viewed in cross section.
- this bellows body (cover member) is a thing which covers the circumference
- the cover member expands and contracts in the axial direction. At that time, there is a possibility that the contact noise may be generated by the parts constituting the cover member being in contact with each other.
- an object of this invention is to suppress generation
- the present invention is a cover member which is provided in the axial direction of a shock absorbing device that cushions an impact, and which is formed in a tubular shape so as to be extensible or bendable in the axial direction, And a plurality of ridges projecting radially outward, a plurality of valleys provided in the axial direction and projecting radially inwards, and a plurality of the plurality provided in the axial direction to connect the ridges and the valleys And at least one of an axial recess formed in the axial direction and an axial protrusion formed in the axial direction in at least one of the peak portion, the valley portion, and the connection portion. It is a cover member provided.
- It is a cylindrical member which is long in the direction, and has a plurality of peak portions having a plurality of peak portions projecting radially outward, a valley portion group having a plurality of valley portions projecting radially inward, the peaks and the valleys
- a cover member having a plurality of connecting portions connecting the plurality of connecting portions, the cover member being arranged in the axial direction, wherein the cover member expands and contracts or bends in the alignment direction of the peak portion and the valley portion;
- a shock absorber having at least one of an axial recess formed in the axial direction and an axial protrusion formed in the axial direction in at least one of the peak group, the valley group, and the connection group. is there.
- FIG. 1 is a view showing a schematic configuration of a suspension system of a first embodiment.
- (A) is a figure which shows the compression state of a suspension system
- (b) is a figure which shows the expansion
- FIG. 1 is an overall overview of a dust cover of Embodiment 1.
- FIG. It is a figure for demonstrating the axial direction recessed part of the dust cover of Embodiment 1.
- FIGS. 7A to 7C are diagrams for explaining a peak-side radial recess and a valley-side radial recess of the dust cover of the first embodiment.
- (A) to (d) are schematic views for explaining the behavior at the time of expansion and contraction of the dust cover of the reference example.
- FIG. (A) is an expanded sectional view of the dust cover concerning a 1st comparative example
- (b) is an expanded sectional view of the dust cover of Embodiment 1.
- FIG. (A) is an expanded sectional view of the dust cover concerning a 2nd comparative example
- (b) is an enlarged sectional view of the dust cover of Embodiment 1.
- FIG. (A) And (b) is a figure for demonstrating the dust cover of Embodiment 2.
- FIG. (A) And (b) is a figure for demonstrating the dust cover of Embodiment 3.
- FIG. (A) And (b) is a figure for demonstrating the dust cover of the modification 1.
- FIG. (A)-(c) is a figure for explaining the dust cover of modification 2.
- FIG. (A)-(d) is a figure for demonstrating the dust cover of modification 4.
- FIG. (A)-(d) is a figure for demonstrating the dust cover of the modification 5.
- FIG. (A)-(c) is a figure for explaining the dust cover of modification 6.
- (A)-(c) is a figure for explaining the dust cover of modification 9. It is a side view of the dust cover of modification 9.
- FIG. (A) And (b) is sectional drawing of the dust cover of the modification 9.
- FIG. It is a figure for demonstrating the dust cover of Embodiment 4.
- FIG. FIG. 18 is an axial sectional view of the entire dust cover of the fifth embodiment.
- FIG. It is an enlarged view of the axial direction cross section of the dust cover of Embodiment 5.
- FIG. It is a figure which shows the state by which the dust cover of Embodiment 5 was compressed most.
- A is an enlarged view of an axial section of the dust cover in which the thickness is gradually decreased from the inner side in the radial direction toward the outer side in the radial direction with respect to the dust cover of the fifth embodiment shown in FIGS. is there.
- (B) is a figure which shows the state by which the dust cover of Embodiment 6 was compressed most.
- FIG. 1 is a view showing a schematic configuration of the suspension device 100 of the first embodiment.
- the suspension system 100 includes a cylinder 10 incorporating a damping device (not shown), a piston rod 20 supporting a piston (not shown) housed in the cylinder 10, and the piston rod 20. And a spring 30 disposed outside the housing.
- the piston rod 20 is a cylindrical or cylindrical member, the piston is attached to one end of the cylinder or the column in the axial direction, and the nut 21 is attached to the other end in the axial direction.
- the axial direction of the cylinder or cylinder of the piston rod 20 is simply referred to as “axial direction”. Further, the lower side in the axial direction is referred to as “one side”, and the upper side in the axial direction is referred to as “the other side”.
- the suspension system 100 (buffer system) according to the present embodiment includes a cylinder 10 for storing oil (liquid), a piston housed in the cylinder 10 for damping the input vibration, and a piston at the tip on one side.
- a valley group having a piston rod 20 having a plurality of ridges, a plurality of ridges 51 having a plurality of ridges 51 projecting radially outward, and a plurality of valleys 52 projecting radially inward.
- a dust cover 50 (cover member) in which a connecting portion group having a plurality of connecting portions 53 connecting the peak portion 51 and the valley portion 52 is disposed in the axial direction.
- the dust cover 50 extends or contracts or bends in the direction in which the peaks 51 and the valleys 52 are aligned, and is formed in the axial direction in the axial direction in at least one of the peaks, valleys, and connecting groups. And at least one of the axially convex portions 56 formed in the axial direction.
- the peak portion group has an axial recess 55 formed in the axial direction.
- the suspension device 100 is attached to the outer periphery of the cylinder 10 and supports the lower spring seat 31 supporting one side of the spring 30, and is attached to the outer periphery of the other side of the piston rod 20 in the axial direction to support the other side of the spring 30
- An upper spring seat 32 is provided.
- a lower seat rubber 35 intervenes between one side of the spring 30 and the lower spring seat 31, and an upper seat rubber 36 intervenes between the other side of the spring 30 and the upper spring seat 32.
- the suspension system 100 includes a wheel side attachment portion 40 provided at the lower portion of the cylinder 10. On the other hand, a bolt 33 for attaching the suspension device 100 to a vehicle body is attached to the upper spring seat 32.
- the suspension device 100 further includes a bump rubber 41 press-fitted to the outer periphery of the piston rod 20 protruding from the cylinder 10 and a bump rubber cup 42 disposed on the outer peripheral portion of the bump rubber 41.
- the suspension system 100 further includes a bump stopper cap 43 mounted on the sliding portion of the piston rod 20 in the cylinder 10. Attached to the bump stopper cap 43 is a cap plate 43a with which the bump rubber 41 collides when the suspension device 100 is fully compressed.
- the other end is attached to the outer periphery of the bump rubber cup 42 and the one end is attached to the lower spring seat 31 to cover the outer periphery of the cylinder 10 and the piston rod 20 therebetween.
- a dust cover 50 is provided.
- One end of the dust cover 50 is fastened to the lower spring seat 31 by, for example, a clamp ring (not shown) and a screw.
- the suspension device 100 is vertically disposed on the other side of the piston rod 20, and is disposed inside a plurality of (two in the first embodiment) mount rubbers 61 and a plurality of mount rubbers 61 that absorb vibration.
- the upper mount rubber 61 of the plurality of mount rubbers 61 is inserted into a recess formed in the upper spring seat 32 so as to be recessed from the other end.
- the mount rubber 61 on one side is covered with an end and an outer periphery on the other side by a mount rubber cup 65 disposed on one side of the upper spring seat 32.
- the dust cover 50 is a bellows-like member, and as shown in FIGS. 1 and 2, the other side covers the outer periphery of the bump rubber cup 42, and one side is attached to the lower spring seat 31.
- the dust cover 50 is disposed between the spring 30 and the cylinder 10 and the piston rod 20, and covers the outer periphery of the cylinder 10 and the piston rod 20. The dust cover 50 will be described in detail later.
- FIG.2 (a) is a figure which shows the compression state of the suspension apparatus 100
- FIG.2 (b) is a figure which shows the expansion
- the suspension system 100 changes to the compressed state shown in FIG. 2A and the extended state shown in FIG. 2B, and the spring 30 absorbs the impact from the road surface and the damping device incorporated in the cylinder 10
- the function as a shock absorbing device that buffers the impact and does not transmit the unevenness of the road surface to the vehicle body, and the function of pressing the vehicle body against the road surface are performed. This improves the ride comfort and steering stability of the vehicle.
- the bellows-like portion of the dust cover 50 also expands and contracts in the axial direction.
- FIG. 3 is a general overview of the dust cover 50 of the first embodiment.
- the left and right direction of the dust cover 50 shown in FIG. 3 is simply referred to as “radial direction”
- the central axis 50 a side is “inward” in the radial direction
- the opposite side to the central axis 50 a is “radial”. It may be called “outside”.
- the dust cover 50 (cover member) of the first embodiment is provided in the axial direction of a suspension device 100 (shock absorbing device) that cushions an impact, and is formed in a tubular shape so as to be extensible or contractible in the axial direction. Be done. Further, as shown in FIG. 1, the suspension device 100 (shock absorbing device) that cushions an impact, and is formed in a tubular shape so as to be extensible or contractible in the axial direction. Be done. Further, as shown in FIG.
- the dust cover 50 is provided with a plurality of axially provided ridges 51 projecting radially outward, and a plurality of axially provided crowns 51 projecting radially inward, A plurality of connecting portions 53 are provided in the axial direction to connect the peak portions 51 and the valley portions 52, and are formed in at least one of the peak portions 51, the valley portions 52 and the connecting portions 53 in the axial direction At least one of the axial recess 55 and the axial projection 56 formed in the axial direction is provided. (In the present embodiment, the ridge 51 is provided with an axial recess 55 formed in the axial direction).
- the dust cover 50 will be described in detail.
- the dust cover 50 has a plurality of peak portions 51 and a plurality of valley portions 52 alternately arranged in the central axis 50 a direction, and a connecting portion 53 connecting the peak portions 51 and the valley portions 52. Further, the dust cover 50 of the first embodiment has an axial recess 55 provided in the axial direction, and a radial recess (peak side radial recess 70 and valley side radial recess 80 described later) provided in the radial direction.
- the dust cover 50 is stretchable in the direction in which the plurality of peak portions 51 are arranged and in the direction in which the plurality of valleys 52 are arranged (in the direction of the central axis 50 a).
- the dust cover 50 is also bendable in the direction intersecting the central axis 50a.
- the central axis 50a of the dust cover 50 is arranged to overlap the central axis of the cylinder or cylinder of the piston rod 20. Therefore, the plurality of peaks 51 and the plurality of valleys 52 of the dust cover 50 are aligned in the axial direction of the cylinder or cylinder of the piston rod 20, and the dust cover 50 expands and contracts in this axial direction (see FIG. 2).
- FIG. 4 is a view for explaining the axial recess 55 of the dust cover 50 of the first embodiment.
- FIG. 4 is a cross-sectional view (a cross-sectional view in the radial direction) seen in a cross-section cut in the radial direction substantially orthogonal to the axial direction of the dust cover 50.
- the axial direction recessed part 55 is formed in the peak part 51, as shown in FIG. Specifically, the axial recessed portion 55 is provided by cutting away from one side to the other side along the axial direction of the dust cover 50 in the mountain portion 51 arranged in the axial direction.
- the axial recess 55 is formed by recessing the ridge 51 from the radially outer side toward the inner side.
- “axial direction” means that the direction is a substantially axial direction, and may be a direction oblique to the axial direction of the dust cover 50.
- a plurality of axial recessed portions 55 are provided in one of the peak portions 51 among the plurality of peak portions 51 provided side by side in the axial direction of the dust cover 50.
- the axial direction recessed part 55 of Embodiment 1 is provided in multiple places (4 places in Embodiment 1) in the circumferential direction of the dust cover 50, as shown in FIG.
- the plurality of axial recesses 55 are arranged at substantially equal intervals in the circumferential direction.
- each axial recessed portion 55 is disposed with an angle of approximately 90 °.
- the circumferential direction of the peak 51 of the dust cover 50 between the one axial recess 55 adjacent to the one axial recess 55 and the other axial recess 55.
- the lengths become the same (for example, the circumferential length of the ridge 51 between the axial recess 55A and the axial recess 55B ⁇ the circumferential length of the ridge 51 between the axial recess 55A and the axial recess 55D ).
- the meaning of “identical” includes not only the same length but also substantially the same.
- the axial direction recessed part 55 is formed in the substantially triangular shape which has a curve part in radial direction cross sectional view.
- the lengths (widths) in the circumferential direction of the axial recesses 55 are formed to be the same. That is, in the first embodiment, the shapes of the plurality of axial recesses 55 are configured to be the same.
- the plurality of axial recesses 55 aligned in the axial direction of the dust cover 50 are arranged along a straight line.
- the meaning of “straight line” includes not only ones that are completely straight but also those that are substantially straight.
- the meaning of "the same position” includes not only ones whose positions in the circumferential direction are exactly the same but also those which are arranged at substantially the same positions.
- FIG. 5 is a view for explaining the peak-side radial recess 70 and the valley-side radial recess 80 of the dust cover 50 of the first embodiment.
- FIG. 5A is a cross-sectional view (a cross-sectional view in the axial direction) seen in a cross-section cut in the axial direction of the dust cover 50.
- 5 (b) is an enlarged view of the Vb portion of FIG. 5 (a)
- FIG. 5 (c) is an enlarged view of the Vc portion of FIG. 5 (a).
- the mountain portion 51 is recessed inward (on the side of the central axis 50a) from the apex 51v of the mountain portion 51 (a portion that collides when the outer surface of the adjacent connecting portion 53 is extended). It has mountain side radial direction crevice 70 (radial direction crevice), and connection part 75 which connects mountain side radial crevice 70 and connecting part 53. That is, in the mountain portion 51, a mountain-side radial concave portion 70 is formed which is recessed toward the side opposite to the radial outer side where the mountain portion 51 protrudes.
- the valley portion 52 is opposite to the bottom 52a of the valley portion 52 (a portion that collides when the inner surface of the adjacent connection portion 53 is extended) and the inner side (the central axis 50a side) It has valley side radial direction crevice 80 (radial direction crevice) dented to the side, and connection part 85 which connects valley side radial crevice 80 and connecting part 53. That is, in the valley portion 52, a valley-side radial direction concave portion 80 is formed which is recessed toward the opposite side to the radial direction inner side where the valley portion 52 protrudes.
- connection part 53 is a part which exhibits a substantially linear shape, as shown to Fig.5 (a),
- the one end part 53p connects with the connection part 75 of the peak part 51
- the other end part 53q is a valley part
- the dust cover 50 is formed so that the cross-sectional shape shown to Fig.5 (a) may be extended over the circumferential direction except the part in which the axial direction recessed part 55 mentioned later is formed.
- the cross-sectional shape of the mountain-side radial direction recess 70 of the mountain portion 51 when cut by a plane parallel to the central axis 50a is U-shaped, and the two sides of the U-shape And a bottom portion 72 of the U-shape, and a side portion 73 between the edge portion 71 and the bottom portion 72.
- the connection part 75 connects the outer side of the mountain-side radial direction recessed part 70, and the connection part 53, as shown in FIG.5 (b).
- the edge portion 71 is a portion having a substantially semicircular shape as shown in FIG. 5 (b).
- the bottom portion 72 is a portion exhibiting a circular arc shape having a central angle of approximately 180 degrees.
- the bottom portion 72 is a portion exhibiting a semicircular shape.
- the side portion 73 is a substantially linear portion connecting the edge portion 71 and one end of the bottom portion 72.
- the connecting portion 75 is a substantially linear portion connecting the connecting portion 53 with the outer portion of the edge portion 71, the bottom portion 72 and the side portion 73.
- the length from the top 51 v to the connecting portion between the connecting portion 75 and the connecting portion 53, in other words, one end 53 p of the connecting portion 53 is set to Lm 0 described later.
- the connecting portion between the connecting portion 75 and the connecting portion 53 is a boundary between the mountain portion 51 and the connecting portion 53.
- the valley-side radial direction concave portion 80 of the valley portion 52 has a mountain shape (inverted U shape) in cross section when cut by a plane parallel to the central axis 50a. It has a skirt 81 which is a skirt of the shape, a peak 82 of the peak, and a side 83 which is between the skirt 81 and the top 82.
- the connection part 85 connects the outer side of the trough side radial direction recessed part 80, and the connection part 53, as shown in FIG.5 (c).
- the foot portion 81 is a portion having a substantially semicircular shape as shown in FIG.
- the top portion 82 is a portion exhibiting a circular arc shape having a central angle of approximately 180 degrees.
- the top portion 82 is a portion exhibiting a semicircular shape.
- the side portion 83 is a substantially straight portion connecting the skirt portion 81 and one end of the top portion 82.
- the connecting portion 85 is a substantially linear portion connecting the connecting portion 53 with the outer portion of the skirt portion 81, the top portion 82 and the side portion 83.
- the length from the bottom 52a to the connection portion between the connection portion 85 and the connection portion 53, in other words, the other end portion 53q of the connection portion 53, is set to Lb0 described later.
- the connection portion between the connection portion 85 and the connection portion 53 is a boundary between the valley portion 52 and the connection portion 53.
- the material of the dust cover 50 is made of, for example, rubber, spring steel, rubber (thermoplastic elastomer, elastomer) or cloth, elastically deformable synthetic resin (TPE), polypropylene (PP) and ethylene-propylene-diene rubber (EPDM). It can be exemplified that it is a synthetic resin. Further, as a method of molding the dust cover 50, blow molding, injection molding, or the like in which resin is put into a mold having at least a mold portion forming the axial direction concave portion 55 and expanded in a form to be fitted inside the mold. , Compression molding, etc. can be exemplified.
- FIG. 6 is a schematic view for explaining the behavior at the time of expansion and contraction of the dust cover 90 of the reference example.
- the dust cover 90 according to the reference example has a peak portion 91 projecting radially outward, a valley portion 92 projecting radially inward, and a connecting portion coupling the peak portion 91 and the valley portion 92. And 93.
- the connecting portion 93 tries to reverse rapidly in the direction in which the axial connecting portions 93 of the dust cover 90 approach the axial direction, as shown in FIG.
- the dust cover 90 deforms in the axial direction so as to crush the space formed between the connecting portions 93 (shown in FIG. 6C).
- one connecting portion 93 contacts the other connecting portion 93, and one connecting portion 93 acts to strike the other connecting portion 93.
- a large contact noise may occur.
- the dust cover 50 of the first embodiment described above (more specifically, the axial recess 55 formed in a bellows shape (in other words, a local recess in the circumferential direction)) is a bellows
- the axial recessed portion 55 divides the sudden reversal operation in the axial direction of the connecting portion 53 in the entire circumferential direction and reduces the generation of the contact noise of the connecting portion 53 divided in the circumferential direction. be able to.
- the dust cover 50 of the first embodiment can suppress the generation of the contact noise of the entire connecting portion 53.
- the suppression effect of the contact sound of the connection part 53 by the dust cover 50 provided with the axial direction recessed part 55 is mentioned from another viewpoint.
- the axial recess 55 (in other words, a local recess in the circumferential direction) absorbs the radial (expansion / contraction) shape deformation of the connecting portion 53 caused by the axial reversing operation of the connecting portion 53 described above. be able to.
- the dust cover 50 of the first embodiment can alleviate the rapid reversal operation in the axial direction of the connecting portion 53. That is, the dust cover 50 can absorb the shape deformation caused by the reversing operation of the connecting portion 53, and can suppress the generation of the contact sound of the connecting portion 53.
- the dust cover 50 of the first embodiment has a peak-side radial recess 70 and a valley-side radial recess 80.
- the size of the dust cover 50 in the radial direction can be shortened, and the rigidity of the dust cover 50 can be improved, and the amount of deformation at the time of the reverse operation can be reduced.
- the dust cover 50 can shorten the full length of the dust cover 50 by having the peak side radial direction recessed part 70 and the valley side radial direction recessed part 80.
- FIG. As a result, it is possible to reduce the number of connecting portions 53 that generate the contact sound.
- the dust cover 50 can suppress generation
- the dust cover 50 can further suppress the generation of the contact sound of the connecting portion 53.
- the effect of suppressing the contact noise of the connecting portion 53 by the peak-side radial recess 70 and the valley-side recess 80 of the dust cover 50 of the present embodiment will be described.
- FIG. 7A is an enlarged cross-sectional view of the dust cover 950 according to the first comparative example.
- FIG. 7B is an enlarged cross-sectional view of the dust cover 50 of the first embodiment.
- the dust cover 950 according to the first comparative example includes a plurality of peak portions 951, valley portions 952, and connecting portions 953.
- the dust cover 950 according to the first comparative example does not have a portion recessed inward from the top 951 v in the peak portion 951, and the bottom in the valley portion 952. There is no portion projecting outward from 952a.
- the dust cover 950 according to the first comparative example includes the dust cover 50 of the first embodiment and the distances Ro1 and Ro0 from the central axes 950a and 50a to the tops 951v and 51v, and the central axes 950a and 50a to the bottoms 952a and 52a.
- the distances Lb1 and Lb0 to the end of are set to be the same.
- the distance between the dust cover 50 of the first embodiment and the adjacent peak portions 951 and between the peak portions 51 (distance between apexes 951 v, distance between apexes 51 v Lo1, Lo0)
- a distance between adjacent valleys 952 and a distance between valleys 52 (a distance between bottom 952a and a distance between bottom 52a Li1 and Li0), an inclination ⁇ r of connecting portion 953 with respect to central axis 950a, and an inclination ⁇ r0 of connecting portion 53 with respect to central axis 50a. Is set to the same.
- a mountain-side radial recess 70 recessed inward from the top 51 v and a valley-side radial recess 80 protruding outward from the bottom 52 a are formed in the ridge 51 and the valley 52. Therefore, as shown in FIGS. 7A and 7B, the distance Rmax0 from the central axis 50a to the tip of the edge portion 71 of the peak portion 51 which is the outermost portion of the dust cover 50 of the first embodiment. Is smaller than the distance Rmax1 from the central axis 950a to the tip of the peak portion 951 which is the outermost portion of the dust cover 950 according to the first comparative example (Rmax0 ⁇ Rmax1).
- the dust cover 50 according to the first embodiment has the peak-side radial recess 70 and the valley-side radial recess 80, thereby reducing the size in the radial direction as compared to the dust cover 950 according to the first comparative example. It can be done.
- the dust cover 50 according to the first embodiment can reduce the size in the radial direction, so that the rigidity can be higher than that of the dust cover 950 according to the first comparative example.
- the reverse operation of the connecting portion 53 can be made difficult to occur.
- the dust cover 50 can reduce the amount of deformation in the axial direction due to the reversing operation of the connecting portion 53 described above by shortening the size in the radial direction. That is, the dust cover 50 has the peak-side radial recess 70 and the valley-side radial recess 80, thereby making it difficult for the connecting portion 53 to reverse itself and suppressing the generation of the contact sound of the connecting portion 53. .
- the total length of the connecting portion 53, the connecting portion 75, and the connecting portion 85, which is thin in the dust cover 50 of the first embodiment, is a peak portion which is a portion that is thin in the dust cover 950 according to the first comparative example.
- the length from the tip of 951 to the tip of valley 952 is shorter.
- a portion where the peak-side radial concave portion 70 of the peak portion 51 and the connection portion 75 intersect and a portion where the valley-side radial concave portion 80 of the valley portion 52 and the connection portion 85 intersect are thicker than the thickness of the connecting portion 53.
- the dust cover 50 can suppress the generation of the contact sound due to the reversing operation of the connecting portion 53 more uniformly in the axial direction.
- FIG. 8A is an enlarged sectional view of the dust cover 1050 according to the second comparative example.
- (B) is an expanded sectional view of dust cover 50 of a 1st embodiment.
- the dust cover 1050 according to the second comparative example differs from the dust cover 950 according to the first comparative example in the following points.
- the distance Lo0 between the adjacent mountain portions 51 (more specifically, the distance between the apexes 51v adjacent to each other) in the dust cover 50 according to the first embodiment corresponds to the adjacent mountain portions 1051 of the dust cover 1050 according to the second comparative example.
- the distance between adjacent valleys 52 in the dust cover 50 according to the first embodiment that is, the distance Li0 between adjacent bottoms 52a is the distance between adjacent valleys 1052 of the dust cover 1050 according to the second comparative example. That is, it is larger than the distance Li3 between adjacent bottoms 1052a.
- the peak 51 of the dust cover 50 of the first embodiment The number of valley portions 52 and connection portions 53 can be smaller than the number of peak portions 1051, valley portions 1052 and connection portions 1053 of the dust cover 1050 according to the second comparative example (peak portions 51 of the first embodiment) Valley number 52, the number of “connection portions 53” ⁇ the number of peak portions 1051 of the second comparative example, the valley portions 1052, and the “connection portions 1053”. That is, since the dust cover 50 according to the first embodiment can reduce the number of connection portions 53 that can be a generation source of the contact sound, the contact sound is less likely to be generated than the dust cover 1050 according to the second comparative example.
- the length of the dust cover 50 in the expansion / contraction direction is reduced when the dust cover 50 is shrunk as much as the number of peaks 51 and valleys 52 of the dust cover 50 is reduced.
- the total length in the most contracted state is shorter than the total length in the most contracted state of the dust cover 1050 according to the second comparative example.
- FIG. 9 is a view for explaining the dust cover 250 of the second embodiment.
- 9 (a) shows a general overview of the dust cover 250
- FIG. 9 (b) shows a partial cross-sectional view of the dust cover 250 in the axial direction.
- the dust cover 50 in which the axial concave portion 55 is formed in the mountain portion 51 is described.
- the mountain side radial concave portion 70 with respect to the mountain portion 51 and the valley portion 52 of the dust cover 50 of the first embodiment It is not necessary to necessarily form the valley-side radial recess 80.
- the dust cover 250 includes a peak 251 projecting radially outward, a valley 252 projecting radially inward, and a peak 251. And a connecting portion 253 connecting the bottom portion 252 and the valley portion 252. And dust cover 250 of Embodiment 2 does not have peak side diameter direction crevice 70 or valley side diameter direction crevice 80 in any of peak part 251 and valley part 252.
- the axial recess 55 may be provided in the axial direction of the dust cover 250.
- the axial direction recessed portions 55 are provided in all the peak portions 251 arranged in the axial direction.
- FIG. 10 is a view for explaining the dust cover 350 of the third embodiment.
- 10 (a) shows a general overview of the dust cover 350
- FIG. 10 (b) shows a partial cross-sectional view of the dust cover 350 in the axial direction.
- the mountain-side radial direction concave portion 70 is formed only on the mountain portion 351.
- An axial recess 55 may be provided in the dust cover 350 of the third embodiment.
- the dust cover 350 according to the third embodiment includes a ridge 351 that protrudes radially outward, a valley 352 that protrudes radially inward, and a ridge 351. And the valley portion 352 are connected.
- the dust cover 350 of the third embodiment is provided with axial recessed portions 55 in all the peak portions 351 arranged in the axial direction.
- the rigidity of the dust cover 350 (more specifically, the bellows portion) is increased, and the connecting portion 353 between the mountain portion 351 and the valley portion 352 is substantially increased. The length can be shortened.
- connection part 353 while making it hard to produce the sudden reversal operation of the axial direction of connection part 353 accompanying expansion and contraction of a bellows part, the amount of (reversal) deformation at the time of reverse operation in the axial direction of connection part 353 (in other words, axial direction Amount of warpage) can be reduced.
- the peak-side radial recess 70 can reduce the number of peaks 351 in the axial direction, the number of valleys 352, and the number of connecting portions 353 linking peaks 351 and valleys 352. That is, since the number of connection parts 353 which perform the rapid reversing operation in the axial direction is reduced along with the expansion and contraction of the dust cover 350, the contact parts between the connection parts 353 can be reduced. The details are as described in the first embodiment.
- FIG. 11 is a view for explaining the dust cover 50 of the first modification.
- FIG. 11A shows a general overview of the dust cover 50 of the first modification.
- FIG. 11 (b) shows a longitudinal cross-sectional view of the dust cover 50 of the first modification.
- the axial direction recessed portion 55 is provided in the peak portion 51. For example, as shown in FIG.
- An axial recess (peak axial recess 511, valley axial recess 552, connecting axial recess 553) may be provided in the connection portion 53 connecting the valley portion 52.
- the axial recess 55 is formed by the ridge axial recess 551 formed in the ridge 51 and the valley axis formed in the valley 52. It is comprised by the direction recessed part 552 and the connection part axial direction recessed part 553 formed in the connection part 53. As shown in FIG. In the dust cover 50, axial recessed portions 55 are formed in all the peak portions 51, the valley portions 52 and the connecting portion 53 which are juxtaposed in the axial direction.
- all the mountain portions 51 arranged in the axial direction are arranged as the mountain group 51G, and all the valleys 52 arranged in the axial direction are formed as the valley group 52G in the axial direction.
- All the connecting portions 53 provided in parallel are called a connecting portion group 53G.
- the peak axial direction recess 551, the valley axial direction recess 552, and the connecting portion axial recess 553 which constitute one axial recess 55 arranged in the circumferential direction are at the same position in the circumferential direction of the dust cover 50. It is formed. That is, the axial recessed portion 55 is formed at (substantially) the same position in the circumferential direction of the mountain portion 51, the valley portion 52, and the connecting portion 53 which are juxtaposed in the axial direction. Therefore, as shown in FIG. 11A, the axial recess 55 is formed substantially linearly in the axial direction as a whole of the dust cover 50.
- the axial direction recessed part 55 locally formed in the circumferential direction of the bellows part of the dust cover 50 of a modification is formed in a row in the axial direction, and is formed in the whole bellows part.
- the axial direction recessed part 55 can make it easy to divide the rapid reversal operation
- the connecting portion 53 can alleviate the rapid reversal operation in the axial direction, and can reduce the sound generated by the connecting portions 53 aligned in the axial direction being in contact with each other. . Therefore, the dust cover 50 of the modified example can more positively prevent the generation of the sound accompanying the expansion and contraction of the dust cover 50 while reducing the adhesion length.
- FIG. 12 is a view for explaining the dust cover 50 of the second modification.
- FIG. 12A shows a general outline view of the dust cover 50 in which the axial direction recessed portion 55 is provided substantially linearly in a state in which it has an angle with the axial direction.
- FIG. 12 (b) shows an overview of the dust cover 50 provided with axial recesses 55 alternately bent in the left and right rotation directions with respect to the dust cover 50.
- FIG. 12 (c) shows a general overview of the dust cover 50 in which the axial recessed portions 55 are provided discontinuously in the axial direction of the dust cover 50.
- mountain portions 51 arranged in the axial direction are separately described, the uppermost mountain portion 51 is referred to as “peak portion 51 a”, and the second mountain portion 51 is referred to as “peak portion 51 b”. In order to distinguish by adding an alphabet at the end.
- the axial recess 55 is provided along the axial direction (the expansion and contraction direction) of the dust cover 50 with respect to the mountain portion 51 juxtaposed side by side in the axial direction.
- the axial recess 55 may not be formed along the axial direction (stretching direction) of the dust cover 50.
- the axial recess 55 may be formed substantially in a straight line with a certain angle to the axial direction of the dust cover 50 or clockwise in the circumferential direction with respect to the dust cover 50 It may be formed to be alternately curved in the CW and counterclockwise CCW in the circumferential direction.
- the axial direction concave portion 55 is formed in all the mountain portions 51 provided in the axial direction.
- the axial direction recessed part 55 formed in the top part peak part 51a is formed in the position A in the circumferential direction.
- the axial recessed portion 55 formed in the second step peak portion 51b is formed at a position B rotated in the clockwise direction CW with respect to the position A of the uppermost recessed portion 55 in the circumferential direction.
- the axial recess 55 formed in the third step peak portion 51c is formed at a position C rotated clockwise in the circumferential direction from the position B of the second recess 55 in the axial direction.
- the axial recessed portion 55 is formed in a substantially straight line in the clockwise direction CW from the uppermost mountain portion 51 a to the lowermost mountain portion 51.
- the axial direction concave portion 55 is formed in all the mountain portions 51 juxtaposed in the axial direction.
- the axial recess 55 is formed alternately curved clockwise and counterclockwise CCW in the circumferential direction with respect to the dust cover 50.
- the axial recessed portion 55 is formed substantially linearly in the clockwise direction CW from the uppermost mountain portion 51a to the fourth mountain portion 51d.
- An axial recessed portion 55 is formed in a substantially straight line in the counterclockwise direction CCW from the fourth step peak 51d to the seventh step peak 51g.
- the axial recessed portion 55 is formed in a straight line in the clockwise direction CW from the seventh stage peak 51 g to the tenth stage peak 51 j.
- An axial recess 55 is formed in a substantially straight line in the counterclockwise direction CCW from the tenth stage peak 51j to the twelfth stage peak 51l.
- the dust cover 50 of the modified example shown in FIGS. 12A and 12B can prevent the generation of sound accompanying the expansion and contraction of the dust cover 50 without largely changing the adhesion length. it can.
- the axially recessed portion 55 formed in the dust cover 50 (more specifically, the peak portion 51) of the modified example shown in FIGS. 12 (a) and 12 (b) described above is “straight in a straight line”. However, it may be skewed "in a curve”.
- axial recesses 55 may be provided intermittently in the plurality of peak portions 51 aligned in the axial direction of the dust cover 50. More specifically, the axial concave portion 55 is not formed in the uppermost ridge portion 51a, and the axial concave portion 55 is formed in the second ridge portion 51b. Further, although the axial recess portion 55 is not formed in the third step peak portion 51c, the axial direction recess portion 55 is formed in the fourth step peak portion 51d. In short, instead of forming the axial recessed portions 55 in all the peak portions 51 in the axial direction, the axial recessed portions 55 may be formed in some of the plurality of peak portions 51 aligned in the axial direction. .
- FIG. 13 is a view for explaining the dust cover 50 of the third modification.
- the axial direction recessed portion 55 is provided in the mountain portion 51, for example, as shown in FIG. 13, the axial direction convex portion 56 in the mountain portion 51 is not provided. May be provided.
- the dust cover 50 of the third modification has an axial protrusion 56 that protrudes outward in the radial direction.
- the axial convex portion 56 is formed in a substantially triangular shape having a curved portion.
- axial direction convex part 56 is provided in the axial direction (expansion and contraction direction) of dust cover 50 to all peak parts 51 arranged in an axial direction.
- the axial direction convex part 56 formed in the line direction in the axial direction can divide the shape deformation of the axial direction of the connection part accompanying expansion and contraction of a bellows part in the circumferential direction.
- the “axially hollow inside” axial convex portion 56 forms a space that absorbs the radial expansion and contraction of the connecting portion 53.
- the axial shape deformation of the connection portion 53 can be alleviated. Therefore, the axial direction convex part 56 whose inside is hollow relieves the rapid axial reversal operation of the connection part 53 accompanying expansion and contraction of the bellows part, and is generated when the connection parts 53 aligned in the axial direction come in contact with each other. Sound can be reduced. Therefore, the dust cover 50 of the modification 3 shown in FIG. 13 can prevent the generation of the contact sound accompanying the expansion and contraction of the dust cover 50 without largely changing the close contact length.
- the thickness portion of the dust cover 50 may be formed inside. Even in the case where the axial convex portion 56 is formed by a meat portion without having a space inside, dust is generated from the rapid reversing operation in the axial direction of the connecting portion 53 accompanying the expansion and contraction of the bellows portion of the dust cover 50 It becomes possible to divide in the circumferential direction of the cover 50 and to reduce the sound (generated by contact between the connecting portions 53) caused by the expansion and contraction of the dust cover 50.
- FIG. 14 is a view for explaining the dust cover 50 of the fourth modification.
- the axial recess 55 is mentioned.
- the axial recessed portion 55 provided in the peak portion 51 of the dust cover 50 according to the first embodiment described above is formed in a substantially triangular shape having a curved portion in radial cross section, for example, as shown in FIG.
- An axial recess 55 as shown in FIG. 14 (d) may be formed.
- you may form the axial direction recessed part 55 in the substantially square shape provided in the peak part 51 in radial direction cross sectional view.
- roundness may be formed in the quadrangular-like vertex part (corner part) of axial direction crevice 55, and it may be made to differ from each other in the length of the quadrangle-like side.
- the axial recessed portion 55 may be formed in a substantially arc shape provided in the peak portion 51. Note that the opening angle, the curvature, the size, and the like of the arc of the axial recess 55 are not limited to the shape shown in FIG.
- the axial recess 55 may be formed in a substantially trapezoidal shape provided in the ridge 51.
- you may form not only in the trapezoid of the axial direction recessed part 55, but another polygonal shape.
- roundness may be formed at the apexes (corners) of the trapezoidal shape of the axial direction concave portion 55, and the lengths of the sides of the trapezoidal shape may be different.
- the axial concave portion 55 is formed in a substantially triangular shape provided in the peak portion 51, for example, having no curved portion at the vertex unlike the first embodiment. May be The sides of the triangle may have different lengths.
- FIG. 15 is a view for explaining the dust cover 50 of the fifth modification.
- a substantially triangular axial convex portion 56 having a curved portion is formed in the peak portion 51 in the radial direction sectional view, for example, as shown in FIG.
- the axial direction convex part 56 as shown in FIG.15 (d) may be formed.
- the shape of the axial protrusion 56 is also substantially triangular, substantially square, round, substantially trapezoidal, etc. projecting in the radial direction of the peak 51, the valley 52, and the connecting portion 53 as in the axial recess 55.
- the polygonal convex axial direction 56 may be formed.
- the axial direction convex part 56 is explained in full detail below.
- axial direction convex part 56 in the substantially square provided in the peak part 51 in radial direction cross sectional view.
- roundness may be formed in the vertex part (corner part) of the square of axial direction convex part 56, and all may be made to differ in the length of the side of a square.
- the axial convex portion 56 may be formed in a substantially arc shape provided on the peak portion 51.
- the opening angle, the size, and the like of the arc of the axial direction convex portion 56 are not limited to the shape shown in FIG.
- the axial convex portion 56 may be formed in a substantially trapezoidal shape provided on the peak portion 51.
- the axial direction convex part 56 may be formed not only in a trapezoid but in another polygonal shape. Further, roundness may be formed at the apex portion (corner portion) of the trapezoidal shape of the axial direction convex portion 56, and the sides of the trapezoidal shape may have different lengths.
- the axial convex portion 56 is provided on the mountain portion 51 and, for example, unlike the first embodiment, is formed in a substantially triangular shape having no curved portion at the apex. May be The lengths of the sides of the triangle of the axial direction convex portion 56 may be different.
- FIGS. 14 (a) to 14 (d) and 15 (a) to 15 (d) described above are all formed in the ridge 51
- it may be formed in the connecting portion 53 or the valley portion 52.
- the axial recessed portion 55 and the axial protruding portion 56 may have the same shape or different sizes in the axial direction.
- the axially recessed portion 55 may be formed with axially recessed portions 55 having different shapes in the axially continuous peak portion 51, the valley portion 52, and the connecting portion 53, respectively.
- a substantially triangular axial recess 55 may be formed in the uppermost ridge 51
- a substantially pentagonal axial recess 55 may be formed in the second ridge 51.
- axial convex portions 56 having different shapes and / or sizes may be formed on the axially continuous peak portion 51, the valley portion 52 and the connecting portion 53, respectively.
- FIG. 16 is a view for explaining the dust cover 50 of the sixth modification.
- four axial recesses 55 are arranged at equal intervals of approximately 90 ° in the circumferential direction in the radial cross section.
- the axial recess 55 may be formed at circumferential positions (intervals) as shown in FIGS. 16 (a) to 16 (c).
- the axial direction recessed part 55 is formed in the valley part 52 in radial direction cross sectional view.
- Four axial recesses 55 are formed at intervals of approximately 90 ° in the circumferential direction.
- adjacent axial recesses 55 may not be formed at equal intervals in the circumferential direction.
- the axial recess 55 is formed in a point-symmetrical position with respect to the central axis 50 a of the dust cover 50.
- the first axial recess 55 a and the second axial recess 55 b are disposed at point-symmetrical positions with respect to the central axis 50 a of the dust cover 50.
- the third axial recess 55 c and the fourth axial recess 55 d are formed in point-symmetrical positions with respect to the central axis 50 a of the dust cover 50.
- the circumferential interval between the first axial recess 55a and the third axial recess 55c and the circumferential interval between the second axial recess 55b and the fourth axial recess 55d are substantially the same. It is.
- the circumferential interval between the first axial recess 55a and the fourth axial recess 55d and the circumferential interval between the second axial recess 55b and the third axial recess 55c are substantially the same. is there.
- the circumferential interval between the first axial recess 55 a and the third axial recess 55 c is different from the circumferential interval between the first axial recess 55 a and the fourth axial recess 55 d.
- the circumferential interval between the first axial recess 55a and the third axial recess 55c is different from the circumferential interval between the second axial recess 55b and the third axial recess 55c.
- the position of the axial recess 55 does not have to be point symmetrical with respect to the center axis 50 a of the dust cover 50 as shown in FIG. Interval may be made different.
- the axial recessed portions 55 are respectively provided in the peak portion 51 and the valley portion 52 in the radial direction sectional view.
- the axial direction recessed part 55 currently formed in the peak part 51 and the axial direction recessed part 55 formed in the trough part are formed in the position of the same phase in the circumferential direction.
- the axial recesses 55 respectively formed in the ridges 51 and the valleys 52 are formed in the same phase as viewed in the radial direction, but the phases are different. I don't care.
- the phase of the axial recess 55 (or the axial projection 56) formed in each of the peak 51 and the connecting portion 53, or the axial recess 55 formed in each of the connecting portion 53 and the valley 52 may be the same or different.
- the number of axial recesses 55 formed in the ridges 51 and the valleys 52 may be different.
- the axial recess 55 is formed in both the peak 51 and the valley 52, an axial recess 55 is provided in the peak 51, and an axial protrusion is formed in the valley 52.
- the unit 56 may be provided.
- the dust cover 50 shown in FIGS. 16 (a) to 16 (c) is an embodiment in which the axial direction concave portion 55 is formed in the peak portion 51 of the dust cover 50, the dust in which the axial direction convex portion 56 is formed Similarly, the cover 50 may change the formation position to another position in the circumferential direction.
- the axial recess 55 is formed substantially linearly in the axial direction, but the axial recess 55 is It does not have to be linear.
- the axial recess 55 may be formed obliquely with respect to the axis of the dust cover 50, or a part of the axial direction may be expanded in the circumferential direction.
- the axial recess 55 may expand in a straight line or in a curved line. The same applies to the axial convex portion 56 with respect to this shape.
- the number of axial recesses 55 or axial protrusions 56 formed in the peak 51, the valley 52, and the connecting portion 53 of the dust cover 50 is, for example, four as shown in the first embodiment. For example, it may be one, or two or more.
- FIG. 17 is a view for explaining the dust cover 50 of the ninth modification.
- 17 (a) shows a front view of the dust cover 50 of the modification 9
- FIG. 17 (b) is a plan view seen from the arrow XVIIb shown in FIG. 17 (a)
- FIG. 17 (c) is a drawing.
- the bottom view seen from arrow XVIIc shown to 17 (a) is shown.
- the rear view of the dust cover 50 of the modification 9 is the same as the front view shown in FIG.
- FIG. 18 is a side view of the dust cover 50 of the ninth modification.
- the left side view and the right side view of the dust cover 50 of the ninth modification are the same.
- 19 is a cross-sectional view of the dust cover 50 of the ninth modification.
- 19 (a) shows an axial sectional view taken along the line XIXa-XIXa of dust cover 50 of modification 9 shown in FIG. 17 (a), and
- FIG. 19 (b) shows the modification shown in FIG. 17 (a).
- FIG. 20 shows a radial cross-sectional view of the XIXb-XIXb cross-sectional line of the dust cover 50 of Example 9.
- the axial direction length and the like of the peak 51 and the valley 52 are not particularly limited.
- the other modified example described above can be applied to the dust cover 50 of the modified example 9 with a long axial length.
- the dust cover 50 according to the first embodiment (the dust cover 50 in which the mountain-side radial recess 70 and the valley-side radial recess 80 are formed in the peak 51 and the valley 52) according to the first embodiment and the first modification of the first embodiment
- the formation position of the axial recess 55 described above the formation of the axial recess 55 in the entire dust cover 50, the formation of the axial protrusion 56, the shapes of the axial recess 55 and the axial protrusion 56
- modifications of the axial concave portion 55 and the axial convex portion 56 are described.
- the dust cover 250 of the second embodiment (embodiment in which the peak-side radial recess 70 and the root-side radial recess 80 are not provided with respect to the peak 51 and the valley 52)
- the present invention can also be applied to the third dust cover 350 (a form in which the mountain-side radial direction concave portion 70 is provided only in the mountain portion 51).
- the axial recess 55 may be provided in one place of the valley 52 or the connection 53, or the ridge
- the axial concave portion 55 (or the axial convex portion 56) may be provided at any two positions 51, the valley portion 52 and the connecting portion 53.
- the axial recessed portion 55 (or the axial protruding portion 56) may be provided at three locations of the peak portion 51, the valley portion 52 and the connecting portion 53.
- the shape, size, and position of the axial recess 55 (or the axial protrusion 56) may be changed without being limited to the dust cover 250 of the second embodiment or the dust cover 350 of the third embodiment.
- modifications 1 to 9 may be applied to a dust cover or the like in which, for example, the axial convex portion 56 or the axial concave portion 55 is provided in the valley portion 52 (252, 352). Needless to say, it can be done.
- the mountain-side radial recess 70 is formed in the ridge 51 of the bellows-like dust cover 50 in which the ridge 51 and the valley 52 are continuous, and the valley-side radial recess 80 is formed in the valley 52.
- the present invention is not particularly limited to the dust cover 50 of the suspension device 100.
- the dust cover 50 according to the present invention is not limited to the dust cover 50 of the suspension apparatus 100, and may be dust, for example, in automobiles (bicycles, four-wheelers, etc.), bicycles, construction machines, hydraulic machines etc. It can be applied to the place where intrusion is prevented.
- the suspension system is not limited to the suspension system in which the spring 30 is disposed on the outer periphery of the dust cover 50 shown in FIGS. 1 and 2, and the spring 30 is disposed in parallel with the damping device.
- the present invention may be used for a suspension system in which 30 is not disposed.
- FIG. 20 is a view for explaining a dust cover 450 of the fourth embodiment.
- FIG. 20 shows a partial cross-sectional view of the dust cover 450 in the axial direction.
- the shape of the mountain portion 51 (more specifically, the mountain-side radial direction recess 70) of the dust cover 50 of Embodiment 1 described above is U-shaped, but is particularly limited to such a shape I will not.
- the shape of the peak portion 451 of the dust cover 450 in the same sectional view as the first embodiment
- the mountain portion 451 of the dust cover 450 of the fourth embodiment has a mountain side radial direction recess 470 and a connection portion 475 connecting the mountain side radial direction recess 470 and the connecting portion 53. .
- the mountain-side radial recess 470 is formed between the two edges 471 projecting radially outward from the connecting portion 53 and between the two edges 471 and is formed radially inward of the edges 471 And a side 473 connecting the edge 471 and the bottom 472.
- the connecting portion 475 is a portion connecting the edge portion 471 of the mountain-side radial direction recess 470 and the connecting portion 53.
- the mountain-side radial recess 470 is substantially V-shaped.
- the two opposing sides 473 (connected to the bottom 472) move toward the opposing side 473 with the center of the bottom 472 and approach. That is, the dust cover 450 can eliminate unnecessary space between the two side portions 473 as much as possible, and the axial length of the entire dust cover 450 can be shortened.
- the dust cover 450 of Embodiment 4 configured as described above can suppress the generation of the contact noise of the entire connecting portion 53 (as in the case of the dust cover 50 of Embodiment 1), and the shaft of the connecting portion 53 It is possible to alleviate the sudden reversal of direction. Moreover, since the dust cover 450 has a substantially V-shaped cross-sectional shape of the peak side radial direction recess 470 when it is cut along a plane parallel to the central axis 50a, the axial length in the compressed state is shortened. It is possible to absorb the shape deformation caused by the reversing operation of the connecting portion 53, and to suppress the generation of the contact sound of the connecting portion 53.
- the peak part 451 of the dust cover 450 of Embodiment 4 is applicable also to other embodiment (For example, dust cover 350 which concerns on Embodiment 3).
- FIG. 21 is an axial sectional view of the entire dust cover 550 of the fifth embodiment.
- FIG. 22 is an enlarged view of an axial cross section of the dust cover 550 of the fifth embodiment.
- FIG. 23 is a diagram showing the dust cover 550 of the fifth embodiment in the most compressed state.
- the valley portion 520 of the dust cover 550 of the fifth embodiment includes a first valley portion 521 and a second valley portion 522 protruding radially outward from the first valley portion 521.
- the first valley portion 521 includes a bottom portion 521 a and a connection portion 521 b connecting the bottom portion 521 a and the connection portion 353.
- the second valley portion 522 includes a bottom portion 522 a and a connection portion 522 b connecting the bottom portion 522 a and the connection portion 353.
- the bottom 522 a of) the second valley 522 protrudes radially outward from the (bottom 521 a of the first valley 521). More specifically, the length Rmin 522 from the central axis 50a to the tip of the bottom 522a of the second valley 522 is longer than the length Rmin 521 from the central axis 50a to the tip of the bottom 521a of the first valley 521 There is.
- the first valleys 521 and the second valleys 522 are alternately arranged in the central axis 50 a direction. That is, the dust cover 550 of the fifth embodiment includes the first valley portion 521, the connection portion 353, the peak portion 351, the connection portion 353, the second valley portion 522, the connection portion 353, the peak portion 351, and the connection in the central axis 50a direction. A set formed in the order of the portions 353 is repeatedly provided in the direction of the central axis 50a.
- the dust cover 550 since the dust cover 550 has a long radial length of the second valley 522, the dust cover 550 forms a space S radially inward of the second valley 522 (between the first valleys 521). can do. In the space S on the inner side in the radial direction of the second valley portion 522, a part of the axial bulge of the first valley portion 521 has entered. In short, the second valley portion 522 (more specifically, the space S radially inward of the second valley portion 522) can absorb the axial direction of the first valley portion 521.
- the axial length L522 of the second valley portion 522 itself is also shorter than the axial length L521 of the first valley portion 521.
- the axial length L522 of the second valley 522 itself is short, and the absorption of the axial length of the first valley 521 by the second valley 522 is combined with the dust cover 550 of the fifth embodiment.
- the dust cover 550 according to the fifth embodiment can shorten the axial length of the entire dust cover 550.
- the axial length of the dust cover 550 having the length 522) is shorter than, for example, the axial length of the dust cover formed of valleys having the same radial length.
- the dust cover 550 of the fifth embodiment having the above-described configuration can suppress the generation of the contact sound of the entire connecting portion 353 (similar to the dust cover 50 of the first embodiment), and the axial direction of the connecting portion 353 Abrupt reverse operation can be mitigated.
- the dust cover 550 includes the valleys (the first valley and the second valley) having different radial lengths, and shortens the axial length in the compressed state. It is possible to absorb the shape deformation associated with the operation and to suppress the generation of the contact sound of the connecting portion 353.
- the configuration of the dust cover 550 of the fifth embodiment (more specifically, the configuration in which two valleys having different radial lengths from the central axis 50a are applied to the valleys 520) is another embodiment (for example, The present invention may be applied to the dust cover 50) of the first embodiment.
- the first valley, the second valley, the first peak, and the second peak which have different radial lengths, may be provided in both the valley and the peak.
- the magnitude correlation of radial direction length of a valley part you may provide three or more valley parts from which radial direction length differs.
- three or more peak portions having different radial lengths may be provided.
- the 1st valley part and 2nd valley part which differ in radial direction are alternately comprised by the axial direction, it does not necessarily need to be comprised alternately.
- Embodiment 6 The dust cover 650 according to the sixth embodiment is different from the dust cover according to the other embodiments in that the thickness is gradually reduced from the inner side in the radial direction toward the central axis 50a to the outer side in the radial direction.
- FIG. 24A shows an axial cross section of a dust cover 650 in which the thickness gradually decreases from the inner side in the radial direction toward the outer side in the radial direction with respect to the dust cover 550 of the fifth embodiment shown in FIGS.
- FIG. FIG. 24 (b) is a view showing a state in which the dust cover 650 of the sixth embodiment is most compressed.
- the thickness of the dust cover 650 of Embodiment 6 gradually increases from the radially inner side (the center axis 50a side) to the radially outer side (the outer peripheral side). It is molded to be thin. More specifically, the thickness t72 of the bottom portion 72 of the peak-side radial direction recess 70 of the peak portion 351 is greater than the thickness t521a of the bottom portion 521a of the first valley portion 521 and the thickness t522a of the bottom portion 522a of the second valley portion 522. It is also molded thin.
- the axial length L 351 of the dust cover 650 (having a thin portion radially outward) is, for example, of the dust cover 650 It becomes shorter than the axial length in the case of the same thickness.
- the dust cover 650 of the sixth embodiment can suppress the generation of the contact noise of the entire connecting portion 353 (as in the dust cover 50 of the first embodiment), and It is possible to alleviate the rapid reversal operation in the axial direction.
- the dust cover 650 has a configuration in which the thickness gradually decreases from the inner side in the radial direction which is the central axis 50a side to the outer side in the radial direction and the axial length in the compressed state is shortened. It is possible to absorb the shape deformation caused by the reversing operation of the portion 353 and to suppress the generation of the contact sound of the connecting portion 353.
- the dust cover 650 of the sixth embodiment may be applied to the dust covers 50 to 550 of the first to fifth embodiments in which the thickness is gradually reduced from the inner side in the radial direction toward the outer side in the radial direction.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Devices (AREA)
- Fluid-Damping Devices (AREA)
Abstract
Description
例えば、特許文献1に記載のジャバラ体(カバー部材)は、その断面でみると両端末の取付部分を除けば山部と谷部の連続で構成されている。なお、このジャバラ体(カバー部材)は、スプリングの内側において、シリンダの周囲を覆う物であることが例示されている。
また、かかる目的のもと、本発明は、液体を収納するシリンダと、前記シリンダ内に収納され、入力される振動を減衰させるピストンと、一方側の先端に前記ピストンを有するピストンロッドと、軸方向に長い筒状の部材であって、径方向外側に突出する山部を複数有する山部群と、径方向内側に突出する谷部を複数有する谷部群と、前記山部と前記谷部とを連結する連結部を複数有する連結部群とが前記軸方向に配置されるカバー部材と、を備え、前記カバー部材は、前記山部と前記谷部との並び方向に伸縮もしくは屈曲し、前記山部群、前記谷部群および前記連結部群の少なくともいずれかに、前記軸方向に形成される軸方向凹部および前記軸方向に形成される軸方向凸部の少なくとも一方を有する緩衝装置である。
<実施形態1>
図1は、実施形態1の懸架装置100の概略構成を示す図である。
懸架装置100は、図1に示すように、減衰装置(不図示)を内蔵するシリンダ10と、このシリンダ10内に収納されたピストン(不図示)を支持するピストンロッド20と、このピストンロッド20の外側に配置されたスプリング30と、を備えている。ピストンロッド20は、円筒状または円柱状の部材であり、円筒または円柱の軸方向の一方の端部側にピストンが取り付けられ、軸方向の他方の端部側にナット21が取り付けられている。
以下、ピストンロッド20の円筒または円柱の軸方向を、単に「軸方向」と称する。また、軸方向の下側を「一方側」、軸方向の上側を「他方側」と称する。
また、懸架装置100は、シリンダ10から飛び出しているピストンロッド20の外周に圧入されたバンプラバー41と、このバンプラバー41の外周部に配置されたバンプラバーカップ42と、を備えている。また、懸架装置100は、シリンダ10におけるピストンロッド20の摺動部に装着されたバンプストッパキャップ43を備えている。このバンプストッパキャップ43には、懸架装置100の最圧縮時にバンプラバー41が衝突するキャップ板43aが取り付けられている。
なお、ダストカバー50については後に詳しく説明する。
懸架装置100は、図2(a)に示す圧縮状態および図2(b)に示す伸張状態に変化し、スプリング30にて路面からの衝撃を吸収したりシリンダ10が内蔵する減衰装置にてスプリング30の伸縮振動を制振したりすることで、衝撃を緩衝して路面の凹凸を車体に伝えない緩衝装置としての機能と、車体を路面に対して押さえつける機能とを果たす。これにより、車両の乗り心地や操縦安定性が向上する。また、懸架装置100における伸縮動作に伴って、ダストカバー50の蛇腹状の部分も軸方向に伸縮する。
図3は、実施形態1のダストカバー50の全体概観図である。
なお、以下の説明において、図3に示すダストカバー50の左右方向を単に「径方向」と称し、中心軸50a側を径方向の「内側」、中心軸50aとは逆側を径方向の「外側」と称する場合がある。
以下、ダストカバー50について詳述する。
そして、ダストカバー50は、これら複数の山部51の並び方向および複数の谷部52の並び方向(中心軸50aの方向)に伸縮自在である。また、ダストカバー50は、中心軸50aに交差する方向に屈曲自在である。このダストカバー50が懸架装置100に装着された状態では、ダストカバー50の中心軸50aがピストンロッド20の円筒または円柱の中心軸と重なるように配置される。それゆえ、ダストカバー50の複数の山部51および複数の谷部52は、ピストンロッド20の円筒または円柱の軸方向に並び、ダストカバー50は、この軸方向に伸縮する(図2参照)。
図4は、実施形態1のダストカバー50の軸方向凹部55を説明するための図である。なお、図4は、ダストカバー50の軸方向と略直交する径方向において切断した断面でみた(径方向断面視)断面図である。
軸方向凹部55は、図3に示すように、山部51に形成される。具体的には、軸方向凹部55は、軸方向に並べて配置される山部51において、ダストカバー50の軸方向に沿って一方側から他方側にかけて切り欠かれることによって設けられる。実施形態1では、軸方向凹部55は、山部51において径方向外側から内側に向けて凹むことで形成される。
なお、本実施形態において『軸方向』とは、略軸方向である事を意味し、ダストカバー50の軸方向に対して斜め方向であってもよい。
なお、本実施形態において、「同一」の意味は、完全に長さが同じであるもののみならず略同一である場合も含む。
なお、本実施形態において、「直線」の意味は、完全に真っ直ぐであるもののみならず略直線である場合も含む。また、「同一の位置」の意味は、周方向における位置が全く同じであるもののみならず、略同一の位置に配置されるものも含む。
図5は、実施形態1のダストカバー50の山側径方向凹部70および谷側径方向凹部80を説明するための図である。なお、図5(a)は、ダストカバー50の軸方向において切断した断面でみた(軸方向断面視)断面図である。また、図5(b)は、図5(a)のVb部の拡大図であり、図5(c)は図5(a)のVc部の拡大図である。
そして、ダストカバー50は、後述する軸方向凹部55が形成される部分を除いて、図5(a)に示した断面形状が周方向に亘って形成されている。
縁部71は、図5(b)に示すように、略半円状を呈する部位である。底部72は、中心角が略180度の円弧状を呈する部位である。言い換えれば、底部72は、半円周状を呈する部位である。側部73は、縁部71と底部72の一方の端部とを接続する略直線状の部位である。
接続部75は、縁部71、底部72および側部73における外側の部位と、連結部53とを接続する略直線状の部位である。なお、頂51vから、接続部75と連結部53との接続部、言い換えれば連結部53の一方の端部53pまでの長さは後述するLm0に設定されている。この接続部75と連結部53との接続部が、山部51と連結部53との境界である。
裾部81は、図5(c)に示すように、略半円状を呈する部位である。頂部82は、中心角が略180度の円弧状を呈する部位である。言い換えれば、頂部82は、半円周状を呈する部位である。側部83は、裾部81と頂部82の一方の端部とを接続する略直線状の部位である。
接続部85は、裾部81、頂部82および側部83における外側の部位と、連結部53とを接続する略直線状の部位である。なお、底52aから、接続部85と連結部53との接続部、言い換えれば連結部53の他方の端部53qまでの長さは後述するLb0に設定されている。この接続部85と連結部53との接続部が、谷部52と連結部53との境界である。
ダストカバー50の材料は、例えば、ゴム、バネ鋼材、ゴム(熱可塑性エラストマ、エラストマー)や布、弾性変形する合成樹脂(TPE)、ポリプロピレン(PP)とエチレン-プロピレン-ジエンゴム(EPDM)とからなる合成樹脂であることを例示することができる。また、ダストカバー50を成形する手法としては、少なくとも軸方向凹部55を形成する型部を有する金型に樹脂を入れ、金型の内側に添わせるような形で膨らませるブロー成形や、インジェクション成形、コンプレッション成形などを例示することができる。
図6は、参考例のダストカバー90の伸縮時の挙動を説明する模式図である。
図6に示すように、参考例のダストカバー90は、径方向外側に突出する山部91と、径方向内側に突出する谷部92と、山部91と谷部92とを連結する連結部93とを有する。
ここで、本実施形態のダストカバー50が有する山側径方向凹部70および谷側径方向凹部80による連結部53の接触音の抑制効果を、(山側径方向凹部70および谷側径方向凹部80による)(A)ダストカバー50の半径方向大きさの低減、及び、(B)ダストカバー50の伸縮時の伸縮方向長さの低減の観点から、以下で詳述する。
図7(a)は、第1の比較例に係るダストカバー950の拡大断面図である。図7(b)は、実施形態1のダストカバー50の拡大断面図である。
第1の比較例に係るダストカバー950は、実施形態1のダストカバー50と同様に、複数の山部951、谷部952、連結部953を有している。しかし、第1の比較例に係るダストカバー950は、実施形態1のダストカバー50と異なり、山部951において、頂951vから内側に凹んだ部位が形成されておらず、谷部952において、底952aから外側に突出した部位が形成されていない。
また、第1の比較例に係るダストカバー950は、実施形態1のダストカバー50と、隣接する山部951間,山部51間の距離(頂951v間,頂51v間の距離Lo1,Lo0)、隣接する谷部952間,谷部52間の距離(底952a間,底52a間の距離Li1,Li0)、中心軸950aに対する連結部953の傾きθr1,中心軸50aに対する連結部53の傾きθr0を同じに設定している。
即ち、実施形態1のダストカバー50は、山側径方向凹部70および谷側径方向凹部80を有することにより、第1の比較例に係るダストカバー950と比較して、半径方向の大きさを低減させることができる。
即ち、ダストカバー50は、山側径方向凹部70および谷側径方向凹部80を有することにより、連結部53の反転動作自体を生じ難くし、連結部53の接触音の発生を抑制することができる。
これにより、薄肉である連結部53等の短縮化、および山部51、谷部52の厚肉化は、ダストカバー50の(ブロー成形時における)肉厚のばらつきを低減させることができる。結果として、ダストカバー50は、連結部53の反転動作による接触音の発生を、軸方向においてより均一に抑制することができる。
図8(a)は第2の比較例に係るダストカバー1050の拡大断面図であり、図8(b)は実施形態1のダストカバー50の拡大断面図である。
第2の比較例に係るダストカバー1050は、第1の比較例に係るダストカバー950に対して、以下の点が異なる。
実施形態1のダストカバー50における隣接する山部51間の距離(より具体的には、隣接する頂51v間の距離)Lo0は、第2の比較例に係るダストカバー1050の隣接する山部1051間の距離(より具体的には、隣接する頂1051v間の距離Lo3)よりも大きい(実施形態1の山部51間の距離Lo0>第2の比較例の山部1051間の距離Lo3)。
同様に、実施形態1のダストカバー50における隣接する谷部52間の距離、つまり隣接する底52a間の距離Li0は、第2の比較例に係るダストカバー1050の隣接する谷部1052間の距離、つまり隣接する底1052a間の距離Li3よりも大きい。
すなわち、実施形態1のダストカバー50は、接触音の発生源となり得る連結部53の数を減らすことができるため、第2の比較例に係るダストカバー1050よりも接触音が発生し難くなる。
図9は、実施形態2のダストカバー250を説明するための図である。なお、図9(a)はダストカバー250の全体概観図を示し、図9(b)はダストカバー250の軸方向における部分断面図を示す。
上述した実施形態1では山部51に軸方向凹部55を形成したダストカバー50を説明しているが、実施形態1のダストカバー50の山部51および谷部52に対して山側径方向凹部70および谷側径方向凹部80を必ずしも形成する必要はない。
そして、実施形態2のダストカバー250は、軸方向に併設される全ての山部251に軸方向凹部55が設けられている。これによって、実施形態2のダストカバー250は、いわゆる密着長(ダストカバー250を最も縮ませた状態におけるダストカバー250の全長)を変化させることなく、ダストカバー250の伸縮に伴う音の発生を防止することができる。
図10は、実施形態3のダストカバー350を説明するための図である。なお、図10(a)はダストカバー350の全体概観図を示し、図10(b)はダストカバー350の軸方向における部分断面図を示す。
図10(a)および図10(b)に示すように、実施形態3のダストカバー350は、山部351にのみ山側径方向凹部70が形成されている。このような実施形態3のダストカバー350に軸方向凹部55を設けてもよい。
そして、上述した山側径方向凹部70による連結部353の反転動作の減少、連結部353の反転動作量の低減、および連結部353の数の低減によるダストカバー350の伸縮による音の発生を防止する効果と、軸方向凹部55による連結部353の軸方向における反転動作の周方向における分断によるダストカバー350の伸縮による音の発生を防止する効果と、が相俟って、蛇腹状のダストカバー350の伸縮に伴う音の発生をさらに防止することが可能になる。
以下の変形例1~9においては、実施形態1のダストカバー50を基本構成として説明を行う。
([変形例1]軸方向凹部55の形成位置について)
図11は、変形例1のダストカバー50を説明するための図である。図11(a)は、変形例1のダストカバー50の全体概観図を示す。また、図11(b)は、変形例1のダストカバー50の縦断面図を示す。
上述した実施形態のダストカバー50においては、山部51に軸方向凹部55を設けているが、例えば、図11(a)に示すように、山部51、谷部52、および山部51と谷部52とを連結する連結部53に軸方向凹部(山部軸方向凹部551、谷部軸方向凹部552、連結部軸方向凹部553)を設けるようにしてもよい。
なお、本実施形態において、ダストカバー50には、軸方向に併設される全ての山部51を山部群51G、軸方向に併設される全ての谷部52を谷部群52G、軸方向に併設される全ての連結部53を連結部群53Gと呼ぶ。
図12は、変形例2のダストカバー50を説明するための図である。図12(a)は軸方向に対して一定の角度を有した状態で略直線状に軸方向凹部55を設けたダストカバー50の全体概観図を示す。また、図12(b)は、ダストカバー50に対して左回転方向および右回転方向に交互に曲がっている軸方向凹部55を設けたダストカバー50の全体概観図を示す。さらに、図12(c)は、ダストカバー50の軸方向において不連続的に軸方向凹部55を設けたダストカバー50の全体概観図を示す。
なお、以下の説明において、軸方向に並べて設けられる山部51を区別して説明するときには、最上段の山部51を「山部51a」、2段目の山部51を「山部51b」といったように末尾にアルファベットを付加して区別する。
例えば、軸方向凹部55は、ダストカバー50の軸方向に対して一定の角度を有した状態で略直線状に形成されるようにしてもよいし、ダストカバー50に対して周方向における時計方向CWおよび周方向における反時計方向CCWに交互に曲がって形成されるようにしてもよい。
図13は、変形例3のダストカバー50を説明するための図である。
実施形態1のダストカバー50においては、山部51に軸方向凹部55を設けているが、例えば軸方向凹部55を設けずに、図13に示すように、山部51に軸方向凸部56を設けるようにしてもよい。
図14は、変形例4のダストカバー50を説明するための図である。
まず、軸方向凹部55について言及する。上述した実施形態1のダストカバー50の山部51に設けられる軸方向凹部55は、径方向断面視において、曲線部を有する略三角形状に形成されているが、例えば、図14(a)~図14(d)に示すような軸方向凹部55を形成するようにしてもよい。
図14(a)に示すように、径方向断面視において、軸方向凹部55は、山部51に設けられた略四角形状に形成してもよい。なお、軸方向凹部55の四角形状の頂点部(角部)に丸みを形成してもよいし、四角形状の辺の長さは、いずれも異なるようにしてもよい。
図15は、変形例5のダストカバー50を説明するための図である。
次に、軸方向凸部56の形状について言及する。上述した変形例3のダストカバー50においては、径方向断面視において、山部51に曲線部を有する略三角形状の軸方向凸部56を形成しているが、例えば、図15(a)~図15(d)に示すような軸方向凸部56を形成するようにしてもよい。
要するに、軸方向凸部56の形状についても、軸方向凹部55と同様に、山部51、谷部52および連結部53の半径方向に突出した略三角形、略四角形、丸形、および略台形等の多角形状の軸方向凸部56を形成してもよい。以下で軸方向凸部56について詳述する。
また、軸方向凹部55や軸方向凸部56は、軸方向において同一の形状であっても大きさが異なるようにしてもよい。
軸方向凸部56も同様に、軸方向に連続する山部51、谷部52および連結部53のそれぞれに異なる形状および/または大きさの軸方向凸部56を形成するようにしてもよい。
図16は、変形例6のダストカバー50を説明するための図である。
上述した実施形態1のダストカバー50においては、径方向断面視において、周方向の略90°の間隔で等間隔に4つの軸方向凹部55が配置されている。しかしながら、例えば、図16(a)~図16(c)に示すような周方向位置(間隔)に軸方向凹部55を形成するようにしてもよい。
しかしながら、第1の軸方向凹部55aと第3の軸方向凹部55cとの周方向間隔と、第1の軸方向凹部55aと第4の軸方向凹部55dとの周方向間隔と、は異なる。同様に、第1の軸方向凹部55aと第3の軸方向凹部55cとの周方向間隔と、第2の軸方向凹部55bと第3の軸方向凹部55cとの周方向間隔と、も異なる。
実施形態1において、1つの山部51に形成された軸方向凹部55に着目してみると、軸方向凹部55は、軸方向に略直線状に形成されているが、軸方向凹部55は、直線状でなくてもよい。敢えて図示はしないが、ダストカバー50の軸線に対して、軸方向凹部55は、斜行した形状でもよいし、軸方向の一部が周方向に膨らんだ形状でもよい。例えば、軸方向凹部55は、直線状に膨らんでいてもよいし、曲線状に膨らんでいてもよい。この形状に関しては、軸方向凸部56についても同様である。
敢えて図示はしないが、ダストカバー50の山部51、谷部52、連結部53に形成される軸方向凹部55もしくは軸方向凸部56の個数は、例えば上述の実施形態1で示した4個に限らず、例えば1個でもよく、2個以上でも構わない。
図17は、変形例9のダストカバー50を説明するための図である。なお、図17(a)は変形例9のダストカバー50の正面図を示し、図17(b)は図17(a)に示す矢印XVIIbからみた平面図であり、図17(c)は図17(a)に示す矢印XVIIcからみた底面図を示す。なお、変形例9のダストカバー50の背面図については、図17(a)に示す正面図と同じである。
図18は、変形例9のダストカバー50の側面図である。なお、変形例9のダストカバー50の左側面図と右側面図とは同じである。
図19は、変形例9のダストカバー50の断面図である。なお、図19(a)は図17(a)に示す変形例9のダストカバー50のXIXa-XIXa断面線の軸方向断面図を示し、図19(b)は図17(a)に示す変形例9のダストカバー50のXIXb-XIXb断面線の径方向断面図を示す。
実施形態1および実施形態1の変形例1~9として、実施形態1のダストカバー50(山部51と谷部52に山側径方向凹部70および谷側径方向凹部80を形成するダストカバー50)を基本構成として、上述した軸方向凹部55の形成位置について、ダストカバー50全体における軸方向凹部55の形成について、軸方向凸部56の形成について、軸方向凹部55および軸方向凸部56の形状について、軸方向凹部55および軸方向凸部56の形成位置等の変形例について言及した。しかしながら、上述した変形例1~9は、実施形態2のダストカバー250(山部51および谷部52に対して山側径方向凹部70および谷側径方向凹部80をそれぞれ設けない形態)、実施形態3のダストカバー350(山部51にのみ山側径方向凹部70を設ける形態)にも適用することができる。
図20は、実施形態4のダストカバー450を説明するための図である。なお、図20はダストカバー450の軸方向における部分断面図を示す。
中心軸50a方向の断面視において、上述した実施形態1のダストカバー50の山部51(より詳細には、山側径方向凹部70)の形状は、U字状であるが、特にかかる形状に限定されない。
例えば、実施形態4のダストカバー450で示すように、(実施形態1と同一断面視において、)ダストカバー450の山部451の形状を略V字状としてもよい。
図20で示すように、実施形態4のダストカバー450の山部451は、山側径方向凹部470と、この山側径方向凹部470と連結部53とを接続する接続部475とを有している。
要するに、中心軸50a方向の断面視において、山側径方向凹部470は、略V字状である。
実施形態5のダストカバー550は、半径方向長さが異なる2つの谷部を有する点が他の実施形態と異なる。以下では、異なる点を中心に説明する。
図21は、実施形態5のダストカバー550全体の軸方向断面図である。
図22は、実施形態5のダストカバー550の軸方向断面の拡大図である。
図23は、実施形態5のダストカバー550が最も圧縮された状態を示す図である。
より具体的には、第1谷部521は、底部521aと、底部521aと連結部353とを接続する接続部521bとを有している。また、第2谷部522は、底部522aと、底部522aと連結部353とを接続する接続部522bとを有している。
また、谷部の径方向長さの大小関係については、径方向長さが異なる3つ以上の谷部を設けてもよい。山部の径方向長さの大小関係についても同様に、径方向長さが異なる3つ以上の山部を設けてもよい。
また、上述した実施形態5において、径方向の異なる第1谷部と第2谷部は、軸方向に交互に構成されているが、必ずしも交互に構成される必要は無い。
実施形態6のダストカバー650は、中心軸50a側である径方向内側から外周側である径方向外側に向かうに従って肉厚を徐々に薄くする構成を採用している点において、他の実施形態のダストカバーと異なる。
図24(a)は、図21及び図22に示した実施形態5のダストカバー550に対して、径方向内側から径方向外側に向かうに従って肉厚を徐々に薄くしたダストカバー650の軸方向断面の拡大図である。図24(b)は、実施形態6のダストカバー650が最も圧縮された状態を示す図である。
Claims (7)
- 衝撃を緩衝する緩衝装置の軸方向に設けられ、前記軸方向に伸縮もしくは屈曲可能に筒状に形成されたカバー部材であって、
前記軸方向に複数設けられて径方向外側に突出する山部と、
前記軸方向に複数設けられて径方向内側に突出する谷部と、
前記軸方向に複数設けられて前記山部と前記谷部とを連結する連結部と、を有し、
前記山部、前記谷部および前記連結部の少なくともいずれかに、前記軸方向に形成される軸方向凹部および前記軸方向に形成される軸方向凸部の少なくとも一方が設けられるカバー部材。 - 前記軸方向凹部は、前記山部に形成される請求項1に記載のカバー部材。
- 前記軸方向凹部は、複数の前記山部に形成され、いずれの前記山部の前記軸方向凹部も周方向において同一の位置に形成され、前記軸方向において直線状に配置される請求項1に記載のカバー部材。
- 一の前記山部は、前記軸方向凹部を複数有し、
前記山部の周方向において隣接する一方の軸方向凹部と、他方の軸方向凹部との間の周方向長さは同一である請求項1に記載のカバー部材。 - 前記山部および前記谷部の少なくとも一方に、突出する径方向と反対側に向かって凹む径方向凹部が形成される請求項1に記載のカバー部材。
- 前記谷部は、第1谷部と、前記第1谷部よりも半径方向外側に突出した第2谷部と、を備える請求項1に記載のカバー部材。
- 液体を収納するシリンダと、
前記シリンダ内に収納され、入力される振動を減衰させるピストンと、
一方側の先端に前記ピストンを有するピストンロッドと、
軸方向に長い筒状の部材であって、径方向外側に突出する山部を複数有する山部群と、径方向内側に突出する谷部を複数有する谷部群と、前記山部と前記谷部とを連結する連結部を複数有する連結部群とが前記軸方向に配置されるカバー部材と、を備え、
前記カバー部材は、前記山部と前記谷部との並び方向に伸縮もしくは屈曲し、前記山部群、前記谷部群および前記連結部群の少なくともいずれかに、前記軸方向に形成される軸方向凹部および前記軸方向に形成される軸方向凸部の少なくとも一方を有する緩衝装置。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014551479A JP5700896B1 (ja) | 2014-03-20 | 2014-10-22 | カバー部材および緩衝装置 |
CN201480002554.3A CN105102849B (zh) | 2014-03-20 | 2014-10-22 | 罩部件和缓冲装置 |
US14/699,498 US10203014B2 (en) | 2014-03-20 | 2015-04-29 | Cover member and shock absorber |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014059262 | 2014-03-20 | ||
JP2014-059262 | 2014-03-20 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/699,498 Continuation US10203014B2 (en) | 2014-03-20 | 2015-04-29 | Cover member and shock absorber |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015141047A1 true WO2015141047A1 (ja) | 2015-09-24 |
Family
ID=54144045
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2014/078049 WO2015141047A1 (ja) | 2014-03-20 | 2014-10-22 | カバー部材および緩衝装置 |
Country Status (2)
Country | Link |
---|---|
CN (1) | CN105102849B (ja) |
WO (1) | WO2015141047A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109789619B (zh) * | 2016-09-30 | 2021-03-05 | 本田技研工业株式会社 | 树脂部件及其成形方法、成形装置 |
CN110508332B (zh) * | 2019-08-21 | 2021-12-07 | 中国航空制造技术研究院 | 一种组合式柔性净气舱装置 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4841681Y1 (ja) * | 1970-12-28 | 1973-12-05 | ||
JPS5975203U (ja) * | 1982-11-12 | 1984-05-22 | マツクス・フアクタ−株式会社 | リキツドフアンデ−シヨン用コンパクト |
JPS59152285U (ja) * | 1983-03-30 | 1984-10-12 | キヨ−ラク株式会社 | 蛇腹ダクト |
DE4233319A1 (de) * | 1992-10-05 | 1994-04-07 | Continental Ag | Hohlkörper, insbesondere Schutzbalg für die Kolbenstange eines Stoßdämpfers |
JP2003004084A (ja) * | 2001-06-22 | 2003-01-08 | Bridgestone Corp | ダストカバー |
JP3122007U (ja) * | 2006-03-14 | 2006-06-01 | 有限会社 ラグナ | ドライブシャフトブーツ |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10267124A (ja) * | 1997-03-24 | 1998-10-09 | Fukoku Bussan Kk | ジャバラ体 |
CN201196243Y (zh) * | 2008-05-07 | 2009-02-18 | 万向钱潮股份有限公司 | 伸缩型防尘罩 |
JP5693391B2 (ja) * | 2011-06-14 | 2015-04-01 | 株式会社ショーワ | カバー部材および懸架装置 |
CN103210233B (zh) * | 2011-11-15 | 2015-04-01 | 住友理工株式会社 | 保护罩及其制造方法 |
-
2014
- 2014-10-22 WO PCT/JP2014/078049 patent/WO2015141047A1/ja active Application Filing
- 2014-10-22 CN CN201480002554.3A patent/CN105102849B/zh active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4841681Y1 (ja) * | 1970-12-28 | 1973-12-05 | ||
JPS5975203U (ja) * | 1982-11-12 | 1984-05-22 | マツクス・フアクタ−株式会社 | リキツドフアンデ−シヨン用コンパクト |
JPS59152285U (ja) * | 1983-03-30 | 1984-10-12 | キヨ−ラク株式会社 | 蛇腹ダクト |
DE4233319A1 (de) * | 1992-10-05 | 1994-04-07 | Continental Ag | Hohlkörper, insbesondere Schutzbalg für die Kolbenstange eines Stoßdämpfers |
JP2003004084A (ja) * | 2001-06-22 | 2003-01-08 | Bridgestone Corp | ダストカバー |
JP3122007U (ja) * | 2006-03-14 | 2006-06-01 | 有限会社 ラグナ | ドライブシャフトブーツ |
Also Published As
Publication number | Publication date |
---|---|
CN105102849B (zh) | 2017-05-10 |
CN105102849A (zh) | 2015-11-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5700896B1 (ja) | カバー部材および緩衝装置 | |
JP5693391B2 (ja) | カバー部材および懸架装置 | |
JP6435741B2 (ja) | バンプストッパキャップ | |
US8272785B2 (en) | Bearing mechanism having sliding bearing | |
CN102966691B (zh) | 筒形隔振装置 | |
JP6637665B2 (ja) | ステアリングホイール | |
JP2014185657A (ja) | ダストカバー組立体 | |
WO2015141047A1 (ja) | カバー部材および緩衝装置 | |
JP2012154355A (ja) | 油圧緩衝器のダストカバー構造 | |
CN105899843A (zh) | 扭转振动降低装置 | |
US10190686B2 (en) | Cover member | |
US9394962B2 (en) | Dust cover | |
JP6714368B2 (ja) | ダストカバー | |
JP6207310B2 (ja) | ダストカバー | |
TWI770326B (zh) | 複合管 | |
JP5531816B2 (ja) | グロメット | |
JP2014105775A (ja) | バンプストッパ | |
KR102108810B1 (ko) | 상단 플라스틱 스트라이커 캡 | |
JP6969833B1 (ja) | テレスコピックカバー | |
JP7328844B2 (ja) | 伸縮部材 | |
JP5077420B2 (ja) | 衝撃吸収式ステアリングコラム装置と電動式パワーステアリング装置 | |
JP5486250B2 (ja) | 衝撃吸収具及び車両用バンパ装置 | |
JP6561681B2 (ja) | 等速ジョイント用のブーツ | |
JP2019190595A (ja) | バンプストッパ | |
JPH071339Y2 (ja) | ブーツ |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref document number: 2014551479 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 201480002554.3 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 14886338 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 14886338 Country of ref document: EP Kind code of ref document: A1 |